A corporatton



am 8', '1924. n 1,480,277

E. H. LICHTENBERG TRACTION GRADING MACHINE Filed Feb. 26 1919 6 Sheets-Sheet l IA/VENTUR. Eric/7 JLfazbe/q BY M# ATTORNEYS WITNESS:

Jan. 8 1924.

E. H. LICHTENBERG TRACTION GRADING MACHINE Flled Feb. 26, l9l9 6 SheetsSheet 2 INVENTOR.

Zim

Wl TNESS;

A TTORNEYS Jan. 8, 1924i 1,480,277

E. H. LICHTENBERG TRACTION GRADING MACHINE Filed Feb. 26 1919 6 SheetsSheet 5 INVENTOR.

M. la@

A TTORNEY1 Wl TNESS:

Jn. s, 1924. 1,480,117?

E. vrH. LICHTENBERG v TRACTION GRADING MACHINE 1919 6 Sheets-Sheet 'i Filed Feb. 26

WITNESS:

ATTORNEYS Jan. 8, l1924.

E. H. LICHTENBERG TRACTION GRADING MACHINE Filed Feb. 26

6 SheetSSheet 5 WIT/UEM:

Jan. 8, 1924,

E. H. LICHTENBERG TRAcTIoN GRADING MACHINE Filed Feb. 26, 1919 e sheets-sheet G Patented Jam, 1924.

UNITED STATES PATE? Fries.

ERICE E. LICHTENBEB'G, 0F MILWAUKEE. WISCONSIN, .ASSGNOFM BY HELENE ASSXG'V- v MENTS, T0 XOEHRING COMPANY, OF IMILVLAJUIIf1 WISCONSIN, A CQRPO'EAZTQN or Wisconsin.

'rme'rxon Genome momen,

To all whom t may concern."

Be it known that I, ERICH H. LICHTEN- nnno, am a citizen of the United States, residinfg nt Milwaukee, in the county of Milwaukee and Stute of lfVisconsin, have invented certain new and useful Improvements in vTraction Grading Machines, of which the following is a specification.

The improvements of this invention up pertain to power driven grading machines, and the rader embodying said improvements is er apted particularly for cutting out road beds for the laying of new roads, for ripping out and loading old macadam, when breaking up old roads. and generell f for grading purposes irrespective of roar con struction.

In addition to the excavating action of the machine, provisions are made for the elevetion und dumping of the excavated nieterinls onto u suitable conveyor designed to transfer the materials laterally from the grader into wagons, trucks, or curs.

The grader of this invention is ot' course designed primarily to reduce the cost oi grading by the elimination of hand labor, und with n view lo effecting the desired oo ject,` it is proposed by the present improvements to provide an especially designed ex eavnting wheel of novel construction ein bullying l'iccnlizu'ly formed :and :irl'nngcil cutting and breaking up elements. 'llic vntling und breaking np elements ure intended to perform their functions with n high degree of effectiveness end with the expense of :t minimum amount of power in their operation.

In the enrrmving out of the invention fnrlhermore` the grading or excuvzxtinpr wheel is supported for udpislment vertically to throw it into and ont of action. :ind to rcg nlutc the depth of excavation. A suitable ironie is therefore employed to carry seid grading wheel und an essential feature ol' novelty of the invention resides in utilizing gear or transmission devices for raising and lowering said frame and its supported grading Wheel, which geur devices are dual in their functioning because not only are they adapted to transmit nmvcinent required in spect to the elevating; and huivering olf tin! Wheel@ but they meintuin the freine against lateral siv y or :nov-ement oy u very rigid action. 'File seid gear d vices forni lateral sway or play preventing ineens for seid frame, not onli; in its vertical movement init such might tend to imported thereto in the digging or excevetingiittion of the exeeveting ineens of the grading vvlicei.

The grading machine of the invention is primarily supported upon caterpillar trae tion devices `und said devicesi are of un irnproved type involving movement limiting ineens for the caterpillar tread supportinff frame obvieting any tendency of the tread to dig in when encountering e, soft space in the uren, in procese of being graded.

Another feature of the invention resides in the peculiar construction and arranca:- ment of the lateral conveyer associated. with the 'grading wheel and ada. ted to carry oi' the materials excavated. rliis conveyor is one adapted to he reversed si as to extend in a right angniar direction from the ma rhino projecting from one side or the other according to predetermined adjustment, and dependent upon the requirements of the work` the grading of which is to be done.

This invention involves other details' of construction which will be understood upon reference to the following descriptions in connection with the accompanying drawings in which:

Figure l is :i side view depicting' in n somewhat dingrnmmntical manner the vari-- ons general ports of the machine and their arrangement relatively to one another;

Figure il is a fragmentary plain vien' showu ing the means for turningr the steering roller in opposite directions;

Figure 3 is an enlarged vertical sectional view taken through the excavating wheel and a portion of the body," of the machine bringing out the construction oi the buckets, the manner of mountin 1 of the iivheel on the movable frame by w ich it is supported. the arrangement of the cojiveyer, andthe opereting devices for raising end lowering' said Iii frame, the latter consisting of herring bone sectors and pinions with suitable drive gearigure et is a fra nientarv view in elevation of one of the errin'g-bone sectors. its matching pinion and certain tlririn r parts;

Figure 5 is a Vvertical transverse sectional View throu h the machine about centrally of the grating wheei and illustratingr the arrangement of the conveyer in full lines as extending 'from one side of the machine,y and in dotted lines as when it is adjusted to project from the other side of the machine:

Figure 6 is a plan view. many parts omitted, bringing ont more clearly the conveyer arrangement; and showing in dotted lines a reversed disposition of the conreycr` supplementing the illustration of Figure 5 in this respect;

Figure S is a side view showing; a portion of the frame of the machine and one of the caterpillars supported thereby. the yielding connection between one end olYI the caterpillar trarne and one end of the main frame being illustrated;

Figure 9 a top plan View of thc parts {lcpicted in Figure S;

ligure lil is :su end view of the caterpillar tread structure and opcratinpr fearing therefor;

Figure ll a side ciev'ation slimming in :i di k i inmatical manner the general ar rangement of the parts ot the machine, ilctails of the latter beingv omitted to enable certain automatic clutch knockout merlin nism to be dlearly shown;

Figure l2 is a detailed view of the clutch knockout device proper. connections with the conreycr and main clutch lever at the motor being` broken away.

Figure l is a perspective View of one of the 'nucl-:ets carried by the grading wheel, slim.v g more particularly the detehabie weer piste provided as a part of the innen portion of the bnckct., to cooperate with the cars-sd liste Throiifibout this specification and in the similar reference characters refer fr parte.

assai in extremely large and com machines et' the type of this in .'ention there is provided a body somewhat in tbc form of a cal A, or similar enclosure.y in which are mounted the motor instrumen.- talities. driving connections leading off to the traction and excavating devices for the machine. Since in many respects the controilingand motor el iving mechanisms employed in this machine are of types conia. fragmentary View showing: a l Grading wheel and illustratingr ,.nicwhat herring-bone for- "mating buckets. and the igrment ol the digging: teeth inonly utilized in large power machines, such features nrc not illustrated in detail, and thebv will not bc so described because tlitt'crcnt types of operating motors, controlling mechanisms including clutch tlcvices, anti trains of fearing are contemplated to be ust-d within the purview of the invention.

Referring! to Figure l therefore it is merely notable that the cab contains a suitable motor l, const ituting a prime mover the .shaft ot' which connected to drive a large gear 3 bj.' means of a smaller gear 4. The gear I is carried by what` will be called a niain driving shaft. Vn said shaft being geared to various other shafts in a manner to En hcrcinaftcr generally set. forth. whereby.l to transmit power to different mechanisms ot' the machine. llxcmplifying the forcgoing` it iwill be noted 'that a lever G in the cab arranged handy for action by the operator standing adjacent. whereby to throw clutch mechanism, not illustrated, so as to turn shaft 7 in either of opposite directions. i

At its rear end the body of the machine supported upon a steering roller and :it its front end sa id body is supported upon two or more spaced caterpillars C. The movable treads of the caterpillars C are turned by suitable driving connections including a spirit-het chain which engages a sprocket wheel E). sce lhgurcs l and 8 to l0 inclusive. The sprocket, chain leads to a sprocket gear l0 upon it shaft ll. The, shaft Il is connected with thc shaft 12 by .suitable intermcrhing gears. and the shaft 1Q is similarly driven from the main shaft 5.

The gradini: or excavating wheel 13 is disposed at the front end ofV the machine, being carried by a frame t4 composed of spaced channels or fabricated in any suitable but substantial manner. The channels ot said traine forni its sides and are pivotally connected at l5 with the hotly of the machine. this connection allowing for an upward and downward movement of the. frame 14 to correspondinglyr control movement of' thtl grading wheel 13 supported hereby.

As seen best in Figures l and 5, a conveyer D is mounted so that a large portion thereof is snrroanded by thc structure of the excavating or grading wheel Eil., an end ol' the conreyer projecting iateraly from said 'wheel in sut-h a manner that materials carried olf by the ruiner@ maj.' disposed in wagons' driven alongside of the machine, in or trucks, or upon the 1ground, if the conditions permit.

The steering of the machine is controlled by the insrumentalitics illustrated in Figure 2, or any suitable .means for the purpose. These instmmentaiities include a shaft 16 geared so as to be operated from lilo the shaft 6. Another shaft 17 has a beveled gear 18 adapted to engage driving beveled gears 19 on the shaft 16. A conventional double clutch element 20 is shiftahle by means not illustrated to connect either one 0f the gears 19 with the shaft 16. Thus, when the latter is driven the shaft 17 may be operated in either direction and its .worm 21 is capable of turning the worm sector 22 in either direction, said sector being rigid on the spindle 23 projecting upwards from the oke in which the roller B is journaled.

e excavating wheel 13 is best seen in Figures 3 and 5. This wheel consists p rimarily of a air of rin 24 between which are arrange and to w ich are bolted each of a circulu'rly disposed series of buckets 25. The buckets 25 are of angular shape. or for purposes of this description they will be characterized as herring-bone shaped buckets. Said buckets therefore have angu lur'sliaped cutting edges and seid cutting edges become effective gradually in acting upon the surface to be cut` broken up, and excavated. Each bucket 25 is equipped with a series of diggingr teeth 26 and the digging teeth of one bucket are peculiarly arranged relatively to those of the next bucket by being staggered. The teeth of one bucket therefore enter the surface op erated on at points between the places where the teeth of the next succeeding bucket enter the surface, as will be obvious from Figure T ot the drawings. The structure in this respect is calculated of course to reduce the shock incident to entering of the cutting and digging elements into the surface being The method ot' suppe-.ting the grading wheel ie by providing suitable rollers 2T. see Figures l, 3, and 5, carried by transverse .shaftsV 28 of u length substantially the saine :is the width ot' the grading wheel. The shafts ure mounted in suitable hearings in brnckcts AL @muv of which ertcnd downwurds und sonic upwards* from the supporting.' l'runu li mi which the whe'cl ii! carried. .\t oppoiaic ends of the excai'utingf wheel lli und ut, thv upper inner hearingr the brackets 2U :irc of special form in that they are constructed with extensions 29, .secu hcst in Figures 3l und 4` which cxhensions are provided with toothed ect-tors 3f), the teeth of which are arranged iuialngous to thr` boues of u herring. for which reason said Sectors: will be hereinafter character izcd un herringbone sectors. Meshing with the sectors` fill :irc the herringbone pinions 31 carried Lf zi shaft 1%2 journaled on the main trame ot thc machine. 0n the shaft .32 is a large geur 33 meshing with a smaller gear 34 keyed to :i shaft 35 on which is fixed a worm wheel 36. The wheel 36 is engaged by a worm 37 on the shaft T previenely described. The shaf T ie adapted te be driven rerersely from the shaft 5 under the control of lever 6. 1t will be Seen therefore tha t"a raising or lowering movement may be imparted to the frame 14 su porting the grading wheel1 at the will of t e perator and by means of the lever 6. The use of the herring-bone gearing devices 30 and 31 provides not only drive gearing for the above purpose` but these gearing devices obviously iold the frame 14 absolutely rigid against lateral sway, and counteract the tendency of obstructions beneath the surface operated upon to force the excavating wheel and the frame laterally.

The imanner in which the buckets 25 are supported relatively to the rings 24 making up the frame Work of the grading wheel will be in Figure 3 which also illus trates how the teeth and cutting portions of the buckets gradually' ent/er the surface being operated upon. It is also notable that the material broken up, cut, and excavated by the buckets is kept in the buckets as they more upwards from their lowermost excavating position, by means of a curved plate 38 suitably supported by curved brackets 39, see. Figure 3, attached to the frame 14 and to supporting angle plates 40 attached in any suitable manner to certain of the brackets 29. those located at the rear upper p0rtion of the frame 14. The cham.: ls which compose the frame 14 hu ve transverse channels attached thereto as shown at 41 in Figure 3 and curved brackets 42 carried by said transverse channels support a conveyor drive shaft 43 Seen best in Figures B and 6. The conveyer operated by said shaft 43 is designated 44 and is of the endless belt type. The gearing for driving the conveyer 44 is shown heet in Figures 5 and (l and consiste of a double beveled gear 45 on a shaft 41". one end of which projects beyond one side of tluntrame 14. ,sce Figure 5, and carriee u sprocket geur 4T. sprocket chain lh, seen diugruinn'inticoIly in Figure l. con norte the sprocket. wheel 4T with a corresponding wheel on the main shuft 5. The drive therefore is tnkcn oll` the mein shaft :1 und communicated to thtA shaft 46 from which it is coniniunicatcd to the shaft 43 of the Convertir by means of the double beveled geur 45 which meshes with the beveled gear 45). On its cud opposite that carryingthe geant() the ehn t`t 43 has a sprocket wheel. 5() connected by a sprocket chain 51 with a. sprocket wheel on the roller shaft 53 :it the outer extremity of the conveyer 44. The inner roiler Shaft of the conveyor 44 is shown :it 54 in Figure 5. The manner in which the materials excavated and elevated h v the buckets 25 are disposed on the convey-er is Sccn best in Figure 3 and the action .it the conveyer in carrying olf said mate- Vrals is obvious.

ln V`Figure 6 there is illustrated by dott/ed lines a rearrangement of the gearing and conveyer parts such as takes place. when the conveyer is to project from the side of the machine opposite that in which 1t is shown in full lines in Figures 5 and 6. Figure 5 also aiiords a partial showing of the rear rangement, see dotted lines. The. rearrangement aforesaid involves merely removal of the bearing for the gear 45 and shiftin sanie a short distance to the left, and a sli ing through the excavator wheel of the whole conveyer 44 and its supporting parts and a redisposition of the shaft 43, as 'shown in dotted left adjustment of Fig. 6, so that Ill its gear 49 is disposed on the opposite side and in mesh with the other face of the beveled gear 45. The shaft 43 under these conditions is shifted to occupy the right dotted line position relative to the conveyer 44 in which they and the shaft are shown in Figure 6. v

In addition to the buckets 25 it will be seen that the rings 24 carry Aon their outer sides outwardly anddownwardly curving buckets 55, the action of which is to cut .i Obviously, a dilferent type of'driving mech anism might be employed in the above connection, the one suggested and diagrammatically illustrated in Figure 1 being really typical of such as may be used.

Referring to Figures 8 to 10 inclusive, the caterpillar will be seen to comprise a frame made up of spaced channel beams forming sides 59, at opposite ends of which are arranged the shafts on which are mounted the rollers 61 about which the caterpillar tread 62 operates. The front shaft 60 carries a large gear 63 meshing with a smaller gear 64 on a shaft 65 which forms a sort of rocker bearing for the whole caterpillar, said shaft passing through the sides of the caterpillar frame near the rear end portion of the latter. The shaft 65 is.sup ported by suitable brackets 66. The turning of the caterpillar tread is effected by operation of the gear 64 through the sprocket Achain 8 previously mentioned, which sprocket chain passes about the gear 9 fixed on the shaft 65, adjacent to the gear 64, all as seen best in Figures 8 to 10 inclusive; The front end portion of the frame of each caterpillar C is yieldingly supported by a spring equalizing device consisting of vertical bars 67 which are surrounded by flanged sleeves 68 engaged by springs 68a adapted to move up and down in brackets G9, seen best in Figure 10. The lower ends of the bars 67 are attached to brackets 70 at opposite sides of the frame 59. It will be obvious that the front end of the frame of each caterpillar is yieldingly held in its proper position for ordinary operation. Owing, however, to the arrangement and movability of the sleeves 68 the front oi'tion of each caterpillar is adapted for s ight upward and downward movement.

Where nearly filled sewer ditches or like soft spots are niet with in the movement of the machine the tendency of ordinary caterpillars is to dig in to said spots, and this tendency is avoided by the construction above set forth.

Figure 11 illustrates diagrammatically an automatic mechanism for disengagin the clutch by whichhthe drive is taken o from the motor to operate the grading wheel 13, and the conveyer D. llhe two conditions under which said means operates are these, namely, where in the turning of the Igrading wheel an obstruction is met with larger than can be. handled by the conveyer D, even though it might be elevated by the buckets 25, it is desirable that the operation of the wheel be stopped to prevent cloggin of the machine; second, in the event tiat during raising of the conveyer the maximum degree of elevation of the latter is reached stoppin of the movement of the conveyer upwar s is advantageous in order to avoid liability of breakage of parts.

The conveyer D is adapted to be raised and lowered by a cable 71, seen in Figures l and 5. It is connected with a bail 72 directly attached to the frame of the conveyor. The cable 71 leads over a pulley 73 on a ramelike. structure 74, thence over a pulley 75 at the upper portion of the cab A, then under a pulley 76 near the floorv of the cab back to a drum 76a on the shaft 15 adapted to he driven by a worm 77 on the shaft 78. The sliatty 7S may be driven from the shaft 16 by suitable means not shown, or from any othersource of power.

The clutch knockout mechanism, see Figures 11 and 12, consists ofa shaft 79 having thereon a series of feeler arms 80 projecting towards the buckets of the wheel 13l so that an unusuall large obstruction, say a, rock or a piece ofy asphalt, will strike said arms 80. Two arms 81 rigid on the shaft 79 project downwardly therefrom and are connected by a rod 82. A sin le arm 83 projects upwardly from one en offthe shaft 79. The arm 83 is connected by a cable 84 which leads to the clutolif lever 85 adjacent the motor 1. A second cable leads1 from one ofthe arms 81 to a point of connection with the frame of the con veyer I). Obviously an obstruction meetin an),v one or more of the `ieeler firms wi reise said arios and rock the shaft 79. In this manner a ull will be exerted on the cable Si and t e clutch automatically shifted to clutch diseiigaging position stop ping the drive mechanism by which the wheel 'i3 is actuated. Again, ii the drinn 76 is. being turned to raise tbe conveyor IL :it a certain point in euch raising movement, e puil will be exerted on the cable 86 and the shaft T9 rocked in n menner like that above described, with the seme result effect ed, namely, Stopping of the drive means by which the convey-er is being actuated.

No danger of injury to the conveyor or surrounding adjacent parte is thus likely.

The buckets Q5 are of peculiar construction in that eecb bucket embodiesV a detach-- able weer plate 25% said plete contacting with the curved plate :i8 which forms a somewhat drinn-like structure about Which the bucketsv revolve. The buckets 25 are. formed at their ends with lugs 25 to which the plates 25 are directl fastened in a substantial but a detachab e manner. Figure 13 shows clearly the detail bucket construction and also cci-tain additional lugs 25 for attaching tbc buckets to the rings 24.

Having thus described my invention, what I claim iis new is:-l

l. In. a grading machine of the class described, the combination of e movable support, a grading device mounted thereon, and a Single menne for raining and lowering seid grading deviceeand for preventing lateral movement of the same.

:21 In an excavating and grading machine of iin rbnriictcr described, tiic combination with :i main support` ci an excai'fating and grading device` an :adju-stable freine inoiinted iipoii the me in support and carrying the excavating and grading means, and gearing having inter-meshing tectli arranged at op- .positie inclinations whereby the gearing serves both to adjust tbe position of the frame and to hold the frame against lateral displacement.

3. ln :i grading machine ot [lic class described, tbc combiniition of n movable snp port, :i grading device mounted thereon, gearing intermediate the Support and the one pinion und tootliedscctor parte, and menne to operate said gearing to elevate or lower flic grading device. tbe herring bone gearing also preventing lati-ini dieplaceu nient ofthe grading device` 4. In a grading machine. the combination grading device. comprising meshing herring-Y `of a wheeled support 1nd menne whereby the same may be propelled, :i rotary grading device carried by said support, a frame imp `porting the grading device and pivotaliy connected with the wheeled support aforesaid, and means to raise and lower said frame relatively to the wheeled support, and correspondingly adjust 'the grading device, comprising n toothed sector connected with the frame and an operating pinion engaging seid sector, the teeth of the sector and inion having n herring-bone arrangement su antiaiiy es described whereby the grading device is held against lateral displacement.

5. Grading means of the class described, comprising a frame, a grading device rotatively mounted thereon including spaced rings and excavating devices connected to and carried by said rings, rollers on the frame supporting and forming anti-friction bearings between the frame and the rings, the engagin portions of said rollers and ringe being Ibeveled in order .to center the grading device in its rotaryfmovement and in order to prevent cutting action of the ioliers relatively to the contacting portions or" the rin s. i

6. Grading means of the class described, comprising a. frame, a, grading device rotatively mounted thereon including spaced rins and excavatin devices connected to an carried by sai rings, .rollers on the frame supporting and forming anti-frictioii bearings between the framey and the rings, the engagin portions of Said rollers and rings being eveled in order to center the grading device in its rotary movement and iii order to prevent cutting action of the rollers relatively to the contacting portions of the rings. the rollers beingr disposed at the outer sides of the rings adjacent to the inner peripherai portions of the latter,` said inner peripheral portions and the inner side pon tions of the rollers bein beveled to esteb- 'lisli the engaging relation and formation above referred to` 7. A grading device of the character de'- ciibed, including a rotary drum, and ii series of excavating buckets mounted thereon in a peripheral series, said buckets being formed with Veliiipcil entering edges arranged in planes Substantially tangential to the drums, :ind adapted to gradually enter the work from their i'st entering ioitions.

A grading device oi the cliiiriicter dei errilicfl inclui'ling zi rotary drinn, transvcrsiciv lislwsrd excavating; bin-kris; mounted llicicon in :i pciipherai Series. cach bucket having; its entering edges of ii foiiiiation re verni-ly angled from e, median point with respect to :i line of cut at iight angle-i to the direction of movement of thc device to thereby progressively apply its cutting edge to the work.

9. A grading device of the class described cozliprining a Wheel Structure cmbodying spaced rings, buckets connected at tiicirvcpposite ende to said rings` and iirrificwl in spaced relation;7 each bucket ha ii wir guiar cutting edge iii-ranged in n subs-tan tially tangential relation in the wheel strucl turc, the series of buckets thereby presenting a sort of herring-bone construction, iin'd curved cutters carried by the said rings on the outer sides thereof, each bucket being equipped with digging teeth :ippiicd in spaced relation thereto adjacent to the cut.- ting edgbe of the bucket., the teeth ot one bucket eing staggered relatively to the teeth of the next adjacent bucket.

10. in en excavating :ind grading ma chine, the combinaiion of in excavating and grading device n io oit-emite the sinne, stopping ineens for discontinuing ojierotinii of the excavating and grading device, and trip means in the. path of 'itairi niiiteriais excavated by the grading device for operai`1 ing the stopping means.

11. In an excavating and finding nuichine, the combination of en excavating and grading device. means to operate the sume, stopping means for discontinuing' operation of thc excavating and grading device. :ind trip means in the path et certain materials excavated by the. excavating and ,grading dcvice for operating tbc stopping: ineens and comprising fecier iii-ms adapted to he acted on by large obstructions cnntiiiiled in the materials excavated.

i2. n Van excavating and grading niachine, the combination of an excavating and grading wheel having excavating buckets, operating means for thc wheel. means to govern the action of said operating means, and trip mechanism including; fccler arms projecting toward the Wheci :ind adapted to be actuated by large obstructioiis handled thereby to actiiate the governing means.

13. A grader of the clnirzictcr describedl including: a rotary druni. excavating buckets mounted thereiiii in a peripheral series. the inner ends of the buckets openingr into the drinn, an apron arranged within the drinn to closeJ the inner ends of the buckets during a portion ofthe movement thereof. the portions 0f the buckets which engage the apron being detaciiiibic. find conveyingr means rcceivinir the materia! discharged from tho buckets when they reach thc cnd of the.

apron.

14. A adingdevice of the cliziriictccdescribed. inirhiding ii rotary drum, buckets mounted thereon in a peripheral .series and opening :it their inner ends into the drum` said inner ends of thc buckets lining termed with separate detachable plates. :i ciirvcd apron arranged within the drum tor cooperation with the said plates to close the inner ends of the buckets durinca portion of the movement thereof and permit the buckets to discharge into thc drum :it n preY determined position, and ineens for receiving the materiai thus dsciiiirged.

i5. A grading inzit-bine of the. character described including a rotary driin'i. excavating buckets arranged thereon in a peripheral series, means for driving tile drinni trip means arranged adjacent. the with et the buckets for engagement 'with iiiiiisnziiir intere pieces of excavated miite'riiih entf. Lnie actuated by the said trip means for controling the before iiientione-:i drive ineens,

l. A. ndin device of the character de scribed, including a rotery drum, n pcripiieral series of excavating inicia-:ets in ineens for driving; the drnnii reci;

ieis projecting erom tile rock simi iewnid thc path of the iniciar fnr engagement, with. isirge pieces of excavating i Yteriei and means actuated by the rock, governing the before mentioned fir i?. A grading iniicliiiie et described comprising si coiiveyer, a movable frame siigiporting the conveyer in tiperativc position, power means for adjusting: the position of the converser. :i trip niei'ni'ier mounted on the nificiiiiic. .stop nieciiginissm for discontinuing operetioii of the. newer means for the cni'iveyeig actuating; cnnnection between the t freine and the trip member, and :i coiiiiei ion between eiiid trip member and the sion meciuiii'sin @here by the latter may be operated through the trip member from the conve er freine.

18. In a grading miichinc,t ie cnrnbiiiiitionV of an excavating device, i1 conveyei. newer means for adjusting the position fr? tbc conveyer and actuating the exctiviitiiir device, stopping means for discontinuing t. e operation of the cxciiviitingV device und the iidjustment of the convcyer. and trip means common to the conveyor and excavating de.- vice whereby to automatically stop either the excavating device or thc adjusting movenient of the conveyer initier :ibnoriniii operatieiis of tlicrsc. parts.

j 19. ln a. grading in'fichinc,tbecombiniition of an esca uiting device, e ri izive;;'er power means for :adjusting the position of the conreyer :ind for actuating the excavating device, stopping;f means for disccntinning the operation ot' the excavating device and the adjustment of the conveye, a trip member for controlling the stopping; mechanism aforesaid :i connection intermediate the trip member and the. stopping mechanism, and n connection between said trip member and thc convcyer.y said trip member being operable incidentto en ebnnrnial movement of the convcyer or from the excavating dcvice in an abnormal excavating operation of the latter.

20. In a grading machine, the combination of an excavating device. i1. conveys-r. power means for adjusting the positinn ot the conveyer and for actuating the exceviib ing device, stopping means for discontinuing the operation of the excavating device Stop mechanism being operable by the trip and the adjustment of the conveyerj a trip member incident either to Contact therewith member arranged contiguous to the excavatby materiai from the excavator or abnormal 1l! ing member, an actuating connection bead'ustrnent of the conveyer.

tween said trip member and the stop mechan testimony whereof I affix my signature. nism, and an actuatin connection between the conveyer and sai trip member, said ERICH H. LICHTENBERG. 

